Drilling machine



May 25 1926.

W. H. MILLER DRILLING MACHINE Filed Jan. 2l, 1926 N xwnmw s@ m s :A

Patented May 25, 1926i.

WILLIAM II.y MILLER', or WIcoNIsco, PENNSYLVANIA.

DRILLING- MACHINE.

Application led January 21, 1926. Serial-No. 82,705.

The invention relates to portable drilling machines, particularly adapted for use in connection with coal mine drills, andhas for its object to provide a portable drilling machine, which is manually operated, and one wherein a rapidv succession of percussive blows may .be imparted on a drill simultaneously with a rotation of the drill, thereby insuring a rapid drilling operation.

A further object is to provide 'a portable drilling` machine comprising a casing having rotatably mounted therein a drill carrying sleeve, which drill carrying sleeve at its vinner end is provided with a bevelled gear which meshes with al bevelled gear carried by an operating shaft to which an operating crank is connected. The operating shaft is provided with a star wheelhaving a plurality of curved arms, which curved arms cooperate with a roller carried by a hammering member slidably mounted in the casing, and which hammering member is provided with oppositely extending guide lugs, one of which carries the roller,and which guide lugs are slidably mounted in bifurcated members formed by oppositely disposed arms ofthe casing sections.

A further object is to provide a shaft adj ustably mounted in the hammering member, and extending into the gear carried sleeve and adapted to impart percussive blowsv on the' drill and a. coiled spring surrounding the shaft and interposed between the hammering member af'nd the rear end of the casing. The adjusting of the hammering member on the .shaft allows varying of the tension of the spring for varying the force of the blows imparted on the drill.

A further object is to provide a handle member at the rear end of the casing, which handle member may be used as a breast plate if desired.

AV further object is to curve the arms of| the star wheel on one of their sides so that the roller will easily ride thereover and to convex the opposite sides of the arms so that the roller will quickly drop in between the arms,thereby insuring a quick hammering action.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention. Y

In the drawings Figure 1 is a horizontal sectional view'V through the portable hammer, parts being brolren away to better show the structure. i Figure 2 is a sectional view taken on line 2 2 of Figure 1'. Y

Referring to the drawing, the numeral-1 designates thecasing of the portable ham-v mer, which casing is formed from registering sections 2, which lsections" are provided with flanges 3,tlirough which securing bolts t extend, whereby the sections can be-separated so thataccess may be had to the inter-` ior of the machine. Casing 1 is provided with a restricted chamber 5 and an enlarged chamber 6, and thev sections 2 of the casing' are provided with spaced arms 7, which when brought together when the sections are assembled form guideirecesses 8 for the lugs 9, which guide the hammering member 10 during its reciprocatioii. One of thev guide lugs 9 is provided with a roller 11 which is mounted on antifrictional bearings 12, and with which roller the curved arms 13 of a star wheel 11v cooperate -during the rotation of the star wheel. The arms v13 are provided with curved surfaces 15 which durino' the rotatioiiof the star wheel engage the roller 11 and force said roller and the hammering element 10 rearwardly.v The opposite sides ofthe star wheel arms are curved, thereby allowing the roller 11 to `quicklydrop between the arms so that the star wheel will not interfere with the forward movement of the hammering member 10. EX- tending longitudinally.through the hammering member 10 is a shaft 16, which is held in various adjusted positions by means of the set .screws,17, and surrounding the shaft 16 and interposed between the rear end of the hammering member 1() and the rear wall i 18V of the casing is a coiled spring 19, whichv coiled spring imparts the forward movement `oii the hammering member 1() and causes the end 2O of the shaft 16 to impart a percussive blow` on the rear end 21 of the drill 22 thereby insuring a hammering action on the drill. Shaft 16 is slidably mounted in a bearing 23 formed by the casing sections 2 at the rear end thereof and in the bearing 24 of the rotatable sleeve 25, which is rotatably mounted in a bearing sleeve 26 between the forward ends of the casing sections 2, therefore it will be seen that the wardly thereby shaft is accurately guided during its reciprocatlon. Byl adjusting the hammering member 10 on the shaft 1G the expansive power of the coiled spring 19 may be varied` for varying the force of the percussive blows of the shaft end 20 on the drill. In coall mining and in other drilling operations it is also desired to rotate the drill 22.

The rotation of t-he drill 22 is accomplished bymeans of a manually operated crank 27, which is carried by the outer end of an operating shaft 28, and which shaft 28 extendsinwardly intoA the chamber 6, and has .mounted thereon the star wheel 14 and a bevelled. gear 29, which bevelled gear meshes with, a bevelled gear 30' carri-ed by the rotatable sleeve 25, therefore it will bewheel 14k-will' cooperate with the roller 11' and force the hammering member 1@ rearcompressing the coiled springy 19, and when the hammering member is vreleased by the arms 13. of' thestar wheel', said coiled spring will force the hammering element forwardly so that the shaft end 20A will impart percussive blows on the drill.

.From the above it will be seen. that a portable drilling machine is provided which is manually operated, compact, positive in its operation and one wherein: the working parts are entirely encasedy and protected from foreign matter, thereby insuring a positive operationqat all times. be seen that the casing sections when brought together'form the bearings for the movable parts as well asl the guide recesses 8.

The inventionhaving been set` forth what is claimed as new and useful. is

1. A portable drill-ing machine comprising a casi-ng, a drilh receiving sleeve rotatably mountedf inone end of the casing, a. hammeringvshaft slidablymounted in thesleeve and adapted tocooperate with a drill; in the Sleeve, a, hammering member ad'justably mounted inthe shaft,L acoiled spring inten The; rear endl oftheA It will. also` posed between the. hammering member and one end of the casing, an operating shaft rotatably mounted in the casing to one side thereof, a gear carried. by the rotatable sleeve, a gear carried 'by the operating shaft and meshing with the first mentioned gear and adapted to rotate the same, an operating crankcarried bytheoperating shaft, a star wheel carried by the operating shaft, oppositely disposed guide lugs carried by the hammering member, a roller carriedv by one of said guide lugs and with which the star wheel cooperates, oppositely disposed arms carried by the casing and forming guide rea cesses. for the lugs, said. casing being formed from sections which when brought together formthe bearings for the movable parts, said lug guide arms being carried. by the sections of thecasing and forming guide recesses when the sections are. brought together.

2. The combination with. a portable drilling `machine comprising a casing. having a hammering element slidably mounted therein and operable under and:V againstthe influence of an expansion spring', lugs carried by the hammering member and slidablv mounted in recesses, a star Awheel cooperating with one of said lugs whereby the hammeringv element isv reciprocated, means for rotating said. star wheel, saidcasing` being formed. from registering sections, said registering sections being provided with oppositely disposed arms, which when brought together form the guide recesses for the lugs.

3. A drilling machine comprising a sectional casing, a sleeve rotatably mounted in one end of said casingandr adapted tol receivea: drilling tool therein, a shaft slidably mounted in the sleeve and: in one end* of the casing, a hammering" member adjustably mounted on the shaft, a coiled .spring surrounding thefshaft and cooperatingl with the hammeringmemberfor forcing the same forwardly, oppositely disposedl guide lugs carried by the hammeringmember and sl-idably mounted in guide recesses, a roller carried-'by one of said lugs, an operatingy shaft, a star wheel carried by the operating shaft and cooperating with the roller, a: bevelled gear carried by the operating shaft.. and a bevelled gear carried bythe rotatable sleeve andi meshing` with the bevelledv gear on the operati-ng shaft.

InY testimony whereof I hereunto affix n signature.

WILLIAM H. MILLER. 

